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Harry Potter uber fans will hardly need a reminder, but for the rest of us: that's almost identical to the conversation had between Hermione and Neville Longbottom in Harry Potter and the Philosopher's Stone, where he shows off his Remembrall - a little device that turns red when its owner has forgotten something.

He sheepishly tells Hermione he has no idea why its changed colour, admitting: "The only problem is, I can't remember what I've forgotten."

It was a blink-and-you'll miss it moment, but delighted fans were quick to share the big news online.

When there's a nod to Harry Potter in a Beauty & the Beast remake and your inner child just CAN'T. https://t.co/UTzZ1yK4oE